Proportional feed system



' May 13,; 1952 r. O I- o 3 2 O u .Cr-asmmcgm. SOLUTION R. T. SHEEN PROPORTIONAL :FEED SYSTEM Filed March 13, 1946 TANK Y INVENTOR.

Patented May 13, 1952 PROPORTIONAL FEED SYSTEM Robert T. Sheen, Wyndmoor, Philadelphia, Pa., assignor to Milton Roy Company, Springfield, Pa., a corporation of Pennsylvania Application March 13, 1946, Serial No. 654,179

6 Claims.

My invention relates to positive proportional mixing systems by which a liquid treating medium is inserted within a flowing liquid to be treated in accurate proportion to the quantity of flow of the liqiud to be treated.

A main purpose of my invention is'to provide definite and positive mixingof the two liquids.

A further purpose is to make the quantity of treating liquid inserted accurately adjustable.

A further purpose is to provide electromagnetic positive insertion of the treating liquid.

Further purposes will appear in the specification and in the claims.

Figure 1 is an elevation partly diagrammatic but largely in sectional side elevation showing the preferred mechanism.

Figures 2, 3, 4 and 5 are perspective views of elements which are shown in the assemblage of Figure 1.

In the drawings similar numerals indicate like parts.

The conduit l carries in so-called raw liquid which is to be treated subsequent to its metering but in proportion to the extent of flow of the row liquid. The treating liquid is taken from chemical liquid tank ll and is injected into the raw liquid at any suitable point by means of a pump 12. Though this pump, as shown, corresponds generally with the pump of M. Roy Sheen, Patent No. 2,367,893, this patent is not intended to represent any form of pump cooperating in a special way with the plunger operating mechanism but is intended merely to represent one form of plunger pump by which the result may be accomplished.

It is clear that the pump need not be confined to a plunger form but could be of any type which can be corelated in its operation to and with the impulses given by the solenoid to which reference is hereafter made. Another convenient form is a diaphragm pump. 7

The flow of the raw liquid passes through the meter I3 on its way, in the form shown, to a mixing tank M.

The pump intakes from the chemical solution tank II and discharges through pipe I into the raw liquid, desirably into a mixing chamber I4 or permissibly merely into a section of the discharge pipe l6, passing ultimately to a point of intended use. If the intake be into the mixing tank M there may be advantage in individual cases in specially selecting the height 'at which the discharge into the tank takes place.

For present purposes, the pump comprises a casing l1 containing a chamber l8 to which in 2 let flows through a pipe I9 and check valves, here shown as two check valves 20 and 2| in series and from which discharge takes place through an outlet check, here shown as two outlet check valves 22 and 23 in series.

The meter I3 is illustrated as a convenient form of rotary mechanism which by its law of operation gives opportunity for contacts at adjustable intervals to close a contactor circuit 24 through an A. C. relay 25 whereby current is passed through the coil 26 of a solenoid 21. It is not essential that the form of meter be rotary, nor even that the contacts be made at a meter. Even if the meter be selected as the effective instrument at which the contacts are made, any form of meter can be used, such for example, as a meter actuated by a weir, orifice or venturi, provided the efiective registering mechanism by which the meter is made to give its indication can carry the contacts and that they be capable of adjustment.

In order to obtain the best magnetic conditions for the solenoid 21, it is quite desirable that the magnetic plunger 28 of the solenoid shall carry a magnetic circuit closure at 29 which at the same time acts as a stop for the plunger movement, conveniently'giving a definite limit to the stroke. The magnetic terminal 29closes the magnetic circuit of the solenoid at each upward movement of the armature.

The armature pivotally supports at 30 a link 3| whose lower end is pivotally connected at 32 to a bell crank, rocker arm, or other lever system 33. The lever, of whatever character, has an axis at 35. An anti-friction wheel 36, lying within a slot 31 of crosshead 38, engages the crosshead-which is part of a composite plunger-- and pushes the pump plunger.

The slotted member 38 is pinned to the piston plunger at 46 and operates against a retracting spring 4| so that with successive actuations of the solenoid the composite plunger is operated to the right in Figure 1 and is retracted to the left in that figure, to perform its pumping functions. The pump plunger passes through packing at 42 and a guide at 43. This latter may also be packing.

The solenoid and associated parts are supported within a frame or casing. The link passes through the slot and the anti-friction bearing wheel is shown as engaging with the surface 44 of the composite plunger within that slot. Y

During the positive (forward) end of the pump movement, the action of the solenoid is tempered by the resistance to compression of the retraction spring. When the current is cut off and the retraction spring is effective to withdraw the piston, control of the speed of movement as well as control of the extent of movement of the plunger become quite desirable. These are effected by a cushion which may be a dash pct 45, a shock absorber, or other device for absorbing the final shock or inertia of the plunger. Its piston 46 moves in a cylinder 41.

The liquid in the cylinder passes from the cyl-' inder at one end and into the cylinder. at. the other end through a by-pass 48 subject to flow control by a screw 49 which operates a pin 58 in-an opening 5|. This, of course, afiects also the pumping movement to the right.

In order to control quite exactly the total pumping action, I regulate the extent to which retraction can take place by a threaded pin 52 operating within a nut 53. The head 54 of the pin becomes eiiective as a stop to movement of the piston 46. The pin 52 is packed at 55.

It; will be noted that control of the retraction does not interfere with total throw of the solenoid armature to a point where the magnetic circuit is closed but does limit the total stroke of the solenoid.

It will be evident that the solenoidal efiort will be. controlled in large; measure by the strength of the retraction spring and by the setting of,

the cushion, and; that the extent of stroke is directly under-control of the adjustment of the extent. of retraction as set within the dash pot cylinder.

In view of. my invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evidentto. others skilled in the art to obtain all or part. of the benefits of my invention without copying the structure shown, and I, therefore,

claim all such insofar as they fall within the reasonable spiritv and scope of my claims.

Having thusv described my invention what I claim as new and desire to secure by Letters Patentis:

1. In an electric proportioning pumpfor supplying liquid to a system in response to electric circuit operation by flow in the system, a solenoid adapted to be energized: at intervals by the electric circuit operation, a positive displacement pump operatively connected tothe solenoid, a shock absorber operatively connected to the pump and controlling the extent. and speed of: operation of the pump and an adjustable stop in the shock absorber for limiting the length of stroke of the pump.

2. In an electric proportioning pump for supplying liquid 9013, system in. re'sponse't'o electric. circuit operation by flow in the system, a solenoid. adapted to be energized at intervals by the operation of the electric circuit, a pump having a cylinder and a piston in the cylinder, the piston being operatively connected tothe solenoid, return means for restoring the piston to the position corresponding with the beginning of the stroke of? the solenoicta. shock absorber operatively connected to the: pump and controlling the speedand extent of throw of the piston and an adjustable stopv in the shock absorber controlling the extent of retractionof the plunger.

3. In an electrieproportioning pump for supplying liquid to a system, in response to electric circuit operation by flow in the system, a solenoid disposed at an angle to the pump, a plunger-type pump, lever means operated by the solenoid for operating the pump plunger, a

cushion operatively connected to the pump con-- trolling the speed of the plunger and stop means interposed in the line of plunger motion and controlling the extent of the stroke of the plunger.

4. In a liquid treating mechanism, a plunger pump having a composite plunger slotted at an intermediate point, a solenoid having an armature adapted to be operated by an electric circuit, means for operating the pump plunger by the solenoid; armature, said means passing through the slot, a retraction spring operating on the plunger, opposing the movement of the plunger and retracting the same, dash pot means operatively connected tothe plunger for slowing the movement of the plunger and an adjustable stop within the dash pot. limiting the distance to which the plunger can. retract.

5. In a. liquid treating mechanism, a plunger pump adapted todeli-ver treating liquid, a rocker arm engaging the pump plunger, a solenoid adapted to be energized by an electric circuit and having an armature, a link connecting the armature and the rocker arm, spring retraction for the pump plunger, a cushion operativelyconnected tothe plunger for retarding the spring retraction, and means adjustable length- Wise of the plunger for limiting the retractive movement of the plunger and. hence limiting the extent of retractive throw of the solenoid armature. V

6. In a pump mechanism, a pistonpump having, a laterally slotted plunger, a solenoid having a winding and an armature, a pivoted rocker arm operatively engaging the plunger, a link operatively connected between the armature and the rocker arm, a retraction spring operatively connected to the plunger for the plunger, a. fluid: cushion operatively connected to the plunger, a fluid restricting control in the cushion and a stop operatively connected to the plunger and adjustablylimiting the retraction of the plunger; v ROBERT '1. SI-EEEN.

REFERENCES CITED I h-e following references are of record in the file of this patent-f UNITED STATES PATENTS Number Name Date Re. 12,331 Deis; Mar.12.8,'.r905 150,115.- Orr- Jan. 19-, 1904 1,346,555 Reeves: 1 1 July 13, 1920 1,534,829 Behnke- 11 Apr. 215 1925 1,789,694 Beman 1 Jan. 29, 1931 1,993,369 Goldberg- Mars 5, 1935 2,023,799 Williams Dec. 10, 1-935 2,241,732- Olson an May 13, 1941 2,252,939 McCoy Aug. 19,1941 2254, 132- Lieberman 6. -2-4. Sept. 2, 1941 2 ,254,495 Randolph et al. Sept: 2, 1-941 2,229.,65d McCoy slain-fine Apr: 21, 1942 2,283,885 Henkell e 1 May 1-9, 1942 2 ,351,893 Sheen Jan.- 23, 1945 2,382,426 Kocher Aug. 14., 19 25 FOREIGN PATENTS Number Country Date hennarv 1 n 210;; 1938 

